Sodium metaborate

  • Borosoap
  • Kodalk
  • Sodium borate
Formula
NaBO2
Structure
Description
White pieces or powder. Odorless.
Uses
Component of cleansers, photographic applications (as hydrates), fire retardant in sodium chlorate, used as a defoliant.

Registry Numbers and Inventories.
CAS
7775-19-1
EC (EINECS/ELINCS)
231-891-6
RTECS
ED4640000
RTECS class
Agricultural Chemical and Pesticide
Merck
12,8785
Beilstein/Gmelin
38326 (G)
EPA OPP
11104
Swiss Giftliste 1
G-7843
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
BNaO2
Formula mass
65.8
Melting point, °C
966
Boiling point, °C
1400
Vapor pressure, mmHg
4E-8 (25 C)
Density
2.464 g/cm3 (20 C)
Solubility in water
260 g/L (20 C)
Heat of fusion
33.6 kJ/mol
Heat of vaporization
383.9 kJ/mol

Hazards and Protection.
Storage
Store in a cool, dry, well ventilated location. Protect from heat, shock and friction. Keep containers closed.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear goggles or face shield when handling.
Respirators
NIOSH approved dusk mask.
Small spills/leaks
Wear protective equipment. Sweep up and place in approved containers.
Stability
Stable on storage.
Incompatibilities
Strong oxidizing agents.
Decomposition
None reported.

Fire.
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Use agent most appropriate to extinguish fire.
Fire potential
Nonflammable tetrahydrate

Health.
Poison_Class
4
Exposure effects
Significant ingestions or dermal exposures can be associated with weak, rapid pulse, cyanosis and abnormally low blood pressure. The patient may present with reduced body temperature, elevated body temperature or normal body temperature. Headache, lethargy, restlessness, weakness, CNS irritation, and/or seizures may occur with long term or repeated exposures. There is insufficient information concerning the reproductive effects of borates in humans. Adverse testicular effects and infertility have been reported in animals. <br>There have been limited animal studies which suggest decreased ovulation, fetotoxicity and developmental defects may occur with very high exposure levels. Maternal toxicity was present in some studies.
   Ingestion
Nausea, vomiting, and diarrhea are common. The vomitus and feces may be blue-green in color. Hemorrhagic gastroenteritis can occur.
   Inhalation
Nausea, vomiting, weakness, headache, coma, death.
   Skin
The oral mucosa, lips and throat may be red. Erythematous rash with desquamation (cooked lobster syndrome) may develop on the palms, soles, and buttocks. A generalized rash has also been reported.
   Eyes
Irritation.

First aid
 
   Ingestion
Activated charcoal: administer charcoal as a slurry (240 ml water/30 g charcoal). Usual dose: 25 to 100 g in adults/adolescents.
   Inhalation
If symptoms develop, move individual away from exposure and into fresh air. If symptoms persist, seek medical attention. If breathing is difficult, administer oxygen. Keep person warm and quiet; seek immediate medical attention.
   Skin
Remove contaminated clothing. Wash exposed area with soap and water. If symptoms persist, seek medical attention. Launder clothing before reuse.
   Eyes
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.

Transport.